Humidity conditioning material, humidity conditioning device, and method for manufacturing humidity conditioning material

Abstract

Provided is a humidity conditioning material with which an amount of absorbed moisture or an amount of released moisture is easily understood. Moreover, provided is a humidity conditioning device including the above humidity conditioning material. Furthermore, provided is a method for manufacturing a humidity conditioning material with which an amount of absorbed moisture or an amount of released moisture is easily understood, and the humidity conditioning material has high humidity conditioning performance. In addition, the humidity conditioning material includes: a humidity conditioning liquid containing a hygroscopic substance; and a holding portion holding the humidity conditioning liquid into a predetermined shape. The holding portion is formed of a polymeric material. The hygroscopic substance contains a hygroscopic metal salt. The humidity conditioning liquid contains a pH indicator, and changes in color in accordance with an amount of moisture contained in the humidity conditioning liquid.

1 . A humidity conditioning material, comprising:
 a humidity conditioning liquid containing a hygroscopic substance; and   a holding portion holding the humidity conditioning liquid into a predetermined shape,   wherein the holding portion is formed of a polymeric material,   the hygroscopic substance contains a hygroscopic metal salt, and   the humidity conditioning liquid contains a pH indicator configured to change in color in accordance with a concentration of the hygroscopic substance with respect to an amount of moisture contained in the humidity conditioning liquid, wherein   the color changes in accordance with an increase or decrease in the concentration.   
     
     
         2 . The humidity conditioning material according to  claim 1 ,
 wherein the pH indicator includes: a first indicator; and a second indicator that exhibits color change in a transition range different from a transition range of the first indicator.   
     
     
         3 . The humidity conditioning material according to  claim 1 ,
 wherein the humidity conditioning liquid contains two or more kinds of the hygroscopic substances.   
     
     
         4 . The humidity conditioning material according to  claim 3 ,
 wherein the hydroscopic substance contains a hygroscopic polyalcohol and a hygroscopic metal salt.   
     
     
         5 . The humidity conditioning material according to  claim 1 ,
 wherein the predetermined shape is in a form of particles.   
     
     
         6 . The humidity conditioning material according to  claim 1 ,
 wherein the polymeric material is a water-absorbing polymer.   
     
     
         7 . The humidity conditioning material according to  claim 5 ,
 wherein the humidity conditioning material has a core-shell structure including: a core containing the humidity conditioning liquid; and   the holding portion formed of the polymeric material and shaped into a shell.   
     
     
         8 . A humidity conditioning device, comprising:
 the humidity conditioning material according to  claim 1 ; and   a housing portion housing the humidity conditioning material,   wherein the housing portion is at least partially transparent to light.   
     
     
         9 . A method for manufacturing a humidity conditioning material, the method comprising:
 a step of preparing a humidity conditioning liquid to include a hygroscopic substance containing a hygroscopic metal salt and a pH indicator configured to change in color in accordance with a concentration of the hygroscopic substance with respect to an amount of moisture contained in the humidity conditioning liquid;   a step of obtaining a liquid mixture in which a polymeric material is mixed with the humidity conditioning liquid, the polymeric material reacting with a gelling agent to form a gel;   a step of dripping the liquid mixture into the gelling agent to obtain particles; and   a step of freeze-drying the particles, wherein   the color changes in accordance with an increase or decrease in the concentration.